Cam mechanism.



E. TRAUB.

CAM MECHANISM.

APPLICATION rILEnnm a. 1907.

2 SHEETS-SHEET 1.

44 Wwm' Patented Dec. 6,1910.

11-1: Mamas PETERS co., wnsmmnorv, n. c.

E. TRAUB.

CAM MECHANISM.

APPLICATION FILED DEC. 3, 1907.

Patented Dec. 6,1910.

2 SHEETS-SHEET 2.

aisss 1H; NORRIS PETERS ca., wuumcrorl, n. c.

UTED STATES EMIL TRAUB, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE SINGERMANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

CAM MECHANISM.

To all whom it may concern:

Be it known that I, EMIL TRAUB, a citizen of the United States, residingat Newark, in the county of Essex and State of New J ersey, haveinvented certain new and useful Improvements in Cam Mechanisms, of whichthe following is a specification, reference being had therein to theaccompanying drawings.

This invention is designed for embodiment more particularly in screwmachines, but is adapted for use in connection with various machinesrequiring a change in the cams to adapt them for a variety of work.

The invention has for its object to provide a cam member wherein theoperative portions are both readily removable and adjustable, in orderthat a single machine may be provided with a set of interchangeablecampieces adapted for producing the diiferent required movements uponthe part or parts to be actuated by said cam.

In the preferred form of the improvement, the cam member comprises adrum having annular guide-flanges affording guiding shoulders around itsedges and an intermediate annular slot dividing its face into twoseparate cylindrical portions, and between such guide-flanges are fittedone or more segmental cam-pieces each bearing in permanent relationtherewith one or more cam portions adapted to engage the followerconnected with the movable part of the machine to be actuated, eachcam-piece having upon its inner face a tongue provided with one or moreapertures and adapted to enter the annular slot of the holding drum towhich it is adjustably secured by means of one or more gibs entering itsaperture or apertures and engaging the inner surface of the drum.

In the accompanying drawings, Figure 1 is a side elevation of a portionof a screw machine embodying the present improvement. Fig. 2 is an edgeview of the cam detached from the machine, and Figs. 3, 4 and 5 areperspective views, respectively, of the holding drum, one of thecam-pieces and one of the gibs for securing the cam-piece in position.

Specification of Letters Patent.

Application filed December 3, 1907.

Patented Dec. 6, 1910. Serial No. 404,887.

The machine is constructed with the frame 1, in which is journaled thelongitudinal cam-shaft 2 driven, asrepresented in dot-ted lines in Fig.1, by means of a worm-wheel 3 and worm l. Fixed upon the cam-shaft is aholding drum or pulley which is shown constructed with the hub 5 havingthe keyway 6 and the broad radial spokes 7 engaging the hub with the rim8 which is shown provided at the edges with the annular ribs or flanges9 beveled inwardly to form inclined seats or shoulders to receive theedges of the campieces. Intermediate the flanges 9 the rim is providedwith an annular slot 10, and the spokes are formedwith registeringnotches 11.

The cam sections or pieces 12, of which five are shown in Fig. 2, areeach of segmental form with their outer cylindrical faces having acurvature concentric with the rim of the holding drum, and upon theirexterior faces are provided with one or more strips 13 whose edgespresent cam portions or shoulders 14 for engagement with the follower,such strips being permanently located and secured to the face of thecam-piece 12 by means of bolts 15 passing through them and tapped intothe cam section or piece.

As represented in Fig. 4c, the uppermost cam-strip 13 has the mostgradual inclination in relation to the edge of the cam-piece, and isdesigned to give the forward or operative movement to the follower,while the other cam-strip 13, serving to return the follower, isdisposed at a more abrupt angle to the direction of motion. The edges ofthe cam-piece are beveled inwardly at 16 upon the under side to fit theadjacent faces of the flanges 9 of the drum 8, and intermediate suchedges is disposed 'a radially projecting tongue 17 adapted to enter theslot 10 in the pulley rim and notches 11 in the spokes, and this tongueis provided in practice with several radial transverse apertures 18.

To secure the cam-piece upon the holding drum with its beveled edgesfirmly seated upon the inclined shoulders afiorded by the flanges 9 ofthe drum, gibs 19 are passed through the holes 18 within the pulley rim.Each of these gibs is provided with a lateral stop-pin 20 adapted toengage the face of the tongue 17 to insure its location at the properlocking point, and it is provided upon one end with a projecting portion21 to engage the inner periphery of the pulley rim 8 and at the oppositeend with an enlargement having a threaded aperture 22 to receive theclamp-screw .43 whose point projects from the same side as theprojection 21 and similarly engages the inner sur face of the rim 8,while the opposite .edge of the gib seats itself upon the inner end ofthe aperture 18. The degree of engagement of the gib with the pulley isdetermined by the force with which the screw engages the pulley rim, asis obvious.

Referring to Fig. l, the machine is shown provided with a followerconsisting of a cylindrical roller 2 1 carried by a stud 25 fixed uponthe reciprocating carriage 26 fitted to suitable ways in the frame andcarrying the rotary tool-holding turret 27. To insure against overthrowthe carriage is provided with a depending lug 28 in which is movablymounted the stop-rod 29 which is secured adjustably in position by meansof the set-screw 30.

As will be readily understood, when it is desired to convert a machinehaving the cam fitted for operation upon one piece of work so that itstool-holder will receive the requisite movements for a dilferent pieceof work, it is merely necessary to loosen the clamping screws remove thegibs and detach each of the cam-pieces to be replaced and to insert byreciprocal operations the requisite cam-pieces, reserving the removedcampieces for use whenever the machine is to be operated for the sameclass of work.

It will be observed that by the present improvement a series of machinesof the class described in a given shop may be provided with cam-drums ofthe character referred to, so that the cam-pieces of a set areinterchangeable not only in connection with any individual machine, butwith any machine of the entire system.

Heretofore it has been the practice to build machines of thisdescription with smooth faced cam-drums and to bolt thereon therequisite cam-strips 18 suitable for a given operation of the machine.lVhen it 'as desired to fit the machine for producing a differentmovement of the part to be moved, the original cam-strips were removedand others were fitted to the face of the drum by either making newholes therein for the fastening screws 15 or else utilizing the oldholes as far as possible and making holes to correspond in thecam-strips, either of which operations was diflicult to perform byreason of the inaccessibility of the cam among the other parts of themachine, while the cam-strips were liable to be inaccurately located aswell, owing to the difliculties connected with the operation. By themethod of construct-ion herein described, the campieces 12, being insections, may be constructed separately from the machine and the strips13 applied thereto in the proper positions, while the cam-pieces may,when applied to the drum, be shifted circularly thereon so as to assumethe exact position required before the tightening of the clamping screws23.

Having thus set forth the nature of the invention, what I claim hereinis 1. A cam-wheel comprising a holding drum provided with a rim havingflaring annular peripheral seats, a segmental camsection fitted to saidseats and provided upon its outer face with a cam portion, and meansapplied to the inner face of said camsection and including a crossmember adapted to engage the inner face of said rim for maintaining saidcam-section firmly but adjustably seated upon the rim of said drum.

2. A cam-wheel comprising a holding drum provided with a rim havingflaring annular peripheral seats, and an intermediate annular slot, asegmental cam-section fitted to said flaring seats and provided upon itsouter face with a cam portion, and fastening means connected with theinner side of the cam section passing through said annular slot andengaging the inner face of the rim at opposite sides of said slotwhereby said cam-section is maintained adjnstably seated upon the rim ofthe drum.

21A cam-wheel comprising a holding drum provided with a cylindrical rimhaving flaring annular seats upon its outer periphery and anintermediate annular slot, a segmental cam-section having its edgesfitted to said fiared annular seats and provided upon its outer facewith a cam portion, and upon its inner surface with a tongue enteringthe annular slot in the rim of said drum, and means applied to saidtongue for maintaining said cam-section firmly but adjustably seatedupon the rim of said drum.

4. A cam-member comprising a holding drum provided with a cylindricalrim having peripheral seats and an intermediate annular slot, asegmental cam-section fitted to said seats and provided with acam-portion on its outer face and with a tongue formed with a transverseaperture and entering the annular slot in the rim of said drum, and agib inserted in said aperture in the tongue and adapted to bear at oneend upon the inner surface of the rim and provided at its opposite endwith a clamping screw engaging said rim.

5. A cam-member comprising a holding drum formed with a rim having anannular slot, a segmental cam-section provided upon its outer face witha cam-portion and upon its inner face with a radial tongue having nameto this specification, in the presence of transverse apertures, and gibsapplied to two subscribing Witnesses.

said apertures and engaging the inner sur- EMU TRAUB face of the rim ofsaid drum for securing J said cam-section adjustably upon said hold-WVitnesses:

ing drum. 7 JOSEPH F. JA UITI-I, In testimony whereof I have signed myHENRY J MILLER.

